Which one should be preset for echo sounder in order to avoid grounding? A. Gain B. Range C. Frequency D. Shallow alarm

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The new system, which should be in use by the end of this month, will replace the current one.(2.0)

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单选题

Which one should be preset for echo sounder in order to avoid grounding?A. Gain B. Range C. Frequency D. Shallow alarm

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Which of the following should be considered personal information?

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When several runways are in use and there is any possibility that the pilot may be confused as to which one to use, the _______ should be stated in the takeoff clearance．

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After starting a diesel engine, which of the listed operating conditions should be checked first?

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